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Autor Calvo Padilla, María Luisa |
Documentos disponibles escritos por este autor (133)
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Rodrigo Martín-Romo, José Augusto ; Caravaca Aguirre, Antonio Miguel ; Alieva, Tatiana Krasheninnikova ; Cristóbal Pérez, Gabriel ; Calvo Padilla, María Luisa | The Optical Society Of America | 2011-03-14Three-dimensional microparticle movements induced by laser beams with a funnel- and tubular pod-like structure, in the neighbourhood of the focal plane of an optical trapping setup, are experimentally studied. The funnel and pod beams constructe[...]![]()
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We present a general formulation for multiple scattering of classical electromagnetic waves by volume gratings. Fujiwara's electron multiple scattering theory is modified and extended to the case of both, the transmission and the reflection geom[...]![]()
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Fernández Álvarez-Estrada, Ramón ; Calvo Padilla, María Luisa | Pergamon-Elsevier Science Ldt | 2004-11We summarize previous researches regarding neutron guides of small transverse cross-section (neutron fibres), smaller than those of the standard hollow guides and collimators employed currently. Those studies may not be widely known in the neutr[...]![]()
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For pt.I see ibid., vol.17, p.475 (1984). The possible confined propagation of slow (thermal) neutrons along cladded waveguides of small cross section (fibres) is studied, in order to improve a previously published analysis. Quite suitable possi[...]![]()
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The authors study confined propagation of slow (thermal) neutrons along (non-hollow) solid fibres made of certain elements (Ti, Mn, ...) such that amplitude for the low-energy nuclear scattering of neutrons on them be negative. Geometrical optic[...]![]()
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The confined propagation of slow neutrons along waveguides of a small cross section (fibres), discussed theoretically some time ago and demonstrated experimentally by other authors later, is analysed further. Motivated by those experiments, a th[...]![]()
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Neutron waveguides in neutron optics: Green's functions formalism with Dirichlet boundary conditions
Molina de la Peña, Ignacio ; Calvo Padilla, María Luisa ; Álvarez Estrada, Ramón F. | Taylor and Francis Ltd. | 2020-06-06In neutron optics, we analyse the propagation of slow (thermal) neutrons along a semi-infinite waveguide limited by a large repulsive potential (reminding the propagation of light along an optical fibre). We set an ideal case of a straight empty[...]![]()
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Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Rodrigo Martín-Romo, José Augusto ; Janz, Siegfried ; Xu, Dan-Xia ; Delâge, André | Elsevier Science BV | 2007-02-01We propose a new type of arrayed waveguide grating (AWG) multiplexer/demultiplexer based on modified group refractive index. This device is composed by an array of straight and parallel waveguides of equal length and each waveguide consist of tw[...]![]()
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Martínez Matos, Óscar ; Cheben, Pavel ; Calvo Padilla, María Luisa ; Rodrigo Martín-Romo, José Augusto ; Monte Muñoz de la Peña, Francisco del | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2007We report recent results obtained with volume holographic gratings recorded in a new photopolymerisable glass modified with high refractive index species at molecular level. Various not previously observed performances have been achieved for dif[...]![]()
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Rigorous approximation techniques for the scattering of a classical electromagnetic wave by fixed obstacles are studied. For that purpose, a new Green's function G^T is introduced, which is divergenceless throughout all space and, hence, less si[...]![]()
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We present a revisited study of the Thompson-Wolf experiment earlier developed in 1957 with the aim to characterize the degree of spatial coherent of a luminous source. We develop further experiments by using laser sources under various modal re[...]![]()
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Villafranca Velasco, Aitor ; Cheben, Pavel ; Florja?czyk, Miros?aw ; Schmid, Jens H. ; Bock, Przemek J. ; Lapointe, Jean ; Delâge, André ; Janz, Siegfried ; Vachon, Martin ; Calvo Padilla, María Luisa ; Xu, Dan-Xia ; Civiš, Svatopluk | Optical Society of America | 2013-07-01We report a spatial heterodyne Fourier-transform spectrometer implemented with an array of optical fiber interferometers. This configuration generates a wavelength-dependent stationary interferogram from which the input spectrum is retrieved in [...]![]()
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Carreras Béjar, Carmen ; Chevalier del Río, Margarita ; Calvo Padilla, María Luisa | The Optical Society Of America | 1984In this paper we present a theoretical model for the transmission function of a biological cell. Three different cases are considered: real transmission function, pure phase object, general case, where both real and complex terms are present in [...]![]()
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Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Calvo Padilla, María Luisa | Optical Society of America | 2006-10On the basis of a matrix formalism, we analyze the paraxial optical systems composed by generalized lenses and fixed free-space intervals, suitable for orthosymplectic transformations in phase space. Flexible configurations to perform the attrac[...]![]()
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Cámara, Alejandro ; Alieva, Tatiana Krasheninnikova ; Rodrigo Martín-Romo, José Augusto ; Calvo Padilla, María Luisa | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2011The application of partially coherent optical beams for imaging, free space communication, random medium analysis requires controlling its mutual intensity. This task can be done using the phase-space tomography method consisting on the reconstr[...]![]()
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Rodríguez, E. E. ; Zúñiga, H. J. ; Tepichín Rodríguez, Eduardo ; Calvo Padilla, María Luisa | American Institute of Physics (AIP) | 2008A programmable digital circuit typically consists of a microprocessor, a memory device, an input data device and an output data device, with its corresponding communication busses. These devices work following a program which is stored in the me[...]![]()
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We consider Fresnel and Fraunhofer diffraction on regular structures generated by multiplicative iterative procedures. We prove that the iterative procedure of field construction is preserved during Fresnel diffraction, while the initiator of th[...]![]()
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Pedraza Velasco, María Lourdes de ; Calvo Padilla, María Luisa | SPIE--The International Society for Optical Engineering | 1990The phase profile of the wave scattered by a GRIN lens has been determined using the eikonal approximation for the scattering amplitude. This wave acts as the object wave in a holographic register to construct a GRIN holocoupler. Different geome[...]![]()
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Cámara, Alejandro ; Alieva, Tatiana Krasheninnikova ; Rodrigo Martín-Romo, José Augusto ; Calvo Padilla, María Luisa | Optical Society of America | 2009-06We propose a simple approach for the phase space tomography reconstruction of the Wigner distribution of paraxial optical beams separable in Cartesian coordinates. It is based on the measurements of the antisymmetric fractional Fourier transform[...]![]()
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Cámara, Alejandro ; Alieva, Tatiana Krasheninnikova ; Rodrigo Martín-Romo, José Augusto ; Calvo Padilla, María Luisa | The Optical Society Of America | 2011-07-11We show the adaptation of a multifunctional optical system consisting of two spatial light modulators for the optimal measurement of the Radon-Wigner transform of one-dimensional signals. The proposed Radon-Wigner display allows reconstructing t[...]![]()
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Permanent holographic storage has been demonstrated in a photopolymerizable organically modified silica glass. The glass was prepared by dispersing a titanocene photoinitiator and a high refractive index acrylic monomer in a porous silica matrix[...]![]()
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Martínez Matos, Óscar ; Calvo Padilla, María Luisa ; Rodrigo Martín-Romo, José Augusto ; Alieva, Tatiana Krasheninnikova ; Hernández Garay, María de la Paz ; Cheben, Pavel ; Martí Panameño, Erwin José Armando | IEEE | 2009We present an overview of the main properties and the emerging implementations corresponding to a photopolymerizable glass modified with high refractive index species (HRIS) incorporated at molecular level. The study concerns to transmission and[...]![]()
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Villafranca Velasco, Aitor ; Hernández Garay, María de la Paz ; Calvo Padilla, María Luisa ; Cheben, Pavel ; Monte Muñoz de la Peña, Francisco del | American Institute of Physics | 2011-03-01Three different holographic photomaterials belonging to the class of photopolymerizable glasses have been synthesized using sol-gel techniques, and characterized with the purpose of a comparative study. Their behavior is analyzed in terms of ach[...]![]()
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Villafranca Velasco, Aitor ; Calvo Padilla, María Luisa ; Cheben, Pavel | American Institute of Physics | 2013-06-21A novel formulation and synthesis method to overcome the thickness limitations in samples of photopolymerizable glasses with high refractive index species is presented. The reported method allows the recording of volume holographic diffraction g[...]